Visual level electric and thermal activation non-stored pressure piston fire extinguishing device

Abstract

The utility model relates to the technical field of fire fighting equipment, concretely is a visual liquid level's electric and heat start non -storage pressure piston formula fire extinguishing device. The device includes medicament pipe, atomizing shower nozzle, and the inside medicament pipe is divided into upper gas production cavity and lower medicament cavity through piston, is equipped with solid aerosol generating agent (mixed fire medicine) in gas production cavity, fills liquid perfluorocyclohexanone in medicament cavity, and composite line is connected electric ignition head and is equipped with feedback line and aerosol generating agent connection, and medicament pipe is equipped with vertical liquid level pipe, and is communicated with medicament cavity through communicating pipeline, and realizes liquid level visualization through cooperation observation window, and the device supports electric heating double start, and liquid level can be intuitively monitored, can feedback working condition after starting, is applicable to the scene such as precision computer room, medical equipment room, and reliability and maintenance convenience significantly improve.

Description

Technical Field

[0001] This utility model relates to the technical field of fire-fighting equipment, specifically to a non-pressurized piston fire extinguishing device with visible liquid level that is electrically and thermally activated. Background Technology

[0002] Firefighting equipment is a critical infrastructure for protecting lives and property. With the increasing societal demand for fire safety and the rapid development of high-end fields such as precision electronics, medical equipment, and data centers, higher requirements are being placed on the reliability, environmental friendliness, and adaptability of fire extinguishing devices. Perfluorohexane is a perfluorinated compound in which all six hydrogen atoms are replaced by fluorine atoms. It is a colorless, odorless, non-toxic, and non-flammable liquid with a series of unique chemical and physical properties. Perfluorohexane has high density, high heat capacity, and high specific heat, allowing it to absorb a large amount of heat in a short time, rapidly lowering the temperature of the fire source and thus extinguishing it. Furthermore, perfluorohexane can form an inert gas layer, preventing air from contacting the fire source and further suppressing its spread. Perfluorohexane can react with oxygen in the fire source to form non-flammable fluorides and water vapor, thereby weakening or eliminating the fire. Simultaneously, the fluorine in perfluorohexane has strong oxidizing properties, which can break the chemical bonds in the fire source, making it unstable and thus extinguishing it.

[0003] To accommodate the liquid storage characteristics of perfluorohexanone, non-pressurized fire extinguishing devices have become the mainstream application due to their advantages of not requiring high-pressure containers, compact size, flexible installation, and high storage safety. However, current non-pressurized perfluorohexanone fire extinguishing devices on the market still suffer from several technical challenges in practical applications, severely restricting their reliability and practicality. These challenges are specifically reflected in the following aspects: First, the activation methods are limited. Currently, non-pressurized perfluorohexanone (PFH) fire extinguishing devices mainly rely on electric or thermal start-up or other methods for independent control, which increases the probability of device failure during activation. The core of the thermal start mode depends on temperature sensitivity. Its activation condition is that the ambient temperature reaches the material limit threshold of the heat-sensitive wire. If the fire is small in the early stage, the local temperature is not conducted to the heat-sensitive wire in time, or the heat-sensitive wire fails to detect the effective temperature due to installation deviation or equipment blockage, the device will fail to activate. The electric start mode relies entirely on the fire detection system and power supply network. Its activation process is "fire detector sensing → signal transmission to the control center → control center sending an electrical signal to the device → fire extinguishing device activation". A failure in any link of this process will lead to device activation failure.

[0004] Secondly, leaks are difficult to detect. Perfluorohexanone is stored in liquid form in non-pressurized devices, and its leakage directly determines the fire extinguishing capability in the event of a fire. However, existing non-pressurized perfluorohexanone devices lack intuitive leak detection methods. Because the devices lack pressure indication structures, it is impossible to determine whether the medium is leaking by observing pressure changes. The only method for detection is "periodic disassembly and weighing," where workers must remove the device from its installation position and weigh it, comparing the initial weight with the current weight. If the weight decreases, a leak is considered to exist. Current market offerings of this type of device cannot visually determine whether the perfluorohexanone medium is leaking, making the process cumbersome and impractical.

[0005] Third, there is a lack of feedback mechanisms. Existing non-pressurized perfluorohexanone (PFH) units lack any signal feedback mechanism after startup, making it impossible for staff to promptly ascertain whether the unit is functioning correctly. In fire emergency response, this deficiency leads to an "information blind spot": if the unit malfunctions due to a faulty starting component, staff cannot detect it through external signals and continue to rely on the unit for firefighting, delaying the opportunity to take alternative firefighting measures (such as using fire extinguishers or activating backup units).

[0006] In summary, existing non-pressurized perfluorohexanone fire extinguishing devices have significant shortcomings in terms of activation reliability, leak detection, and operational feedback. Therefore, developing a new fire extinguishing device is a key direction for addressing current technical pain points and promoting the upgrading of fire protection equipment, possessing significant technical value and market significance. Utility Model Content

[0007] To address the shortcomings of existing technologies, this invention provides a non-pressurized piston fire extinguishing device with visible liquid level that can be started electrically and thermally, thus solving the problems mentioned in the background section.

[0008] To achieve the above objectives, this utility model is implemented through the following technical solution: a visible liquid level electrically and thermally activated non-pressurized piston fire extinguishing device, comprising an agent tube and an atomizing nozzle; characterized in that: a gas-generating chamber cap is fixed at the top of the agent tube, and a nozzle cap is fixed at the bottom; through holes are provided at its four corners; a piston matching the internal structure is provided inside the agent tube; the piston divides the agent tube into an upper gas-generating chamber and a lower agent chamber; a solid aerosol generator is provided at the top of the piston in the gas-generating chamber; and the agent chamber is filled with a sufficient amount of liquid perfluorohexanone; The gas-generating chamber cover is equipped with a thermal wire and a composite wire. The thermal wire passes through the gas-generating chamber cover and connects to the aerosol generator inside the gas-generating chamber. The composite wire connects to an electric igniter inside the gas-generating chamber, and the electric igniter is connected to the aerosol generator. The agent tube has a vertical liquid level tube in the through hole at the lower left corner. The agent tube has an observation window directly in front of the liquid level tube. There are two connecting pipes penetrating the left wall at the upper and lower positions inside the agent chamber, and the two connecting pipes are respectively connected to the upper and lower parts of the corresponding liquid level tubes. The atomizing nozzle is located at the center of the bottom of the nozzle cover and passes through it, and is connected to the agent chamber.

[0009] Preferably, the aerosol generator contains gunpowder components.

[0010] Preferably, the liquid level tube is provided with two sealing plugs symmetrically at the top and bottom, and the sealing plugs are sealed with sealing rings between them and the through holes of the reagent tube, and a pipeline is provided in the middle to communicate with the vertical liquid level tube.

[0011] Preferably, each sealing plug is divided into upper and lower parts, and a connecting pipe is connected to the space between the two parts and the two parts are positioned opposite each other.

[0012] Preferably, the sealing plug has a connecting through hole in the space between the upper and lower parts, which is connected to both the connecting pipeline and the pipeline in the middle of the sealing plug.

[0013] Preferably, each of the connecting pipes is provided with a tightening screw at the outlet on the left wall of the drug tube, and the tightening screw is pressed against the sealing plug; a liquid level plate is provided at the lower part of the observation window on the front of the drug tube and is connected to the bottom of the liquid level tube.

[0014] Preferably, the atomizing nozzle has a pressure diaphragm at the top where it connects to the drug chamber.

[0015] Preferably, the gas generation chamber cover and the nozzle cover are respectively provided with mounting brackets at their top and bottom.

[0016] This invention provides a non-pressurized piston fire extinguishing device with visible liquid level, which is electrically and thermally activated, and has the following advantages: 1. Dual-start design: The device integrates both thermal start and composite line electric start modes. In the event of a fire, if the electric start fails due to detection system malfunction or power outage, the rising ambient temperature can trigger thermal start. If the thermal start fails due to thermal wire obstruction or temperature not reaching the threshold, the electric start can be triggered via command from the control center. This dual-mode complementarity ensures that "at least one start method is effective" in fire scenarios, completely eliminating the risk of fire suppression failure caused by a single start method. It is particularly suitable for scenarios with extremely high reliability requirements, such as data centers and medical equipment rooms.

[0017] 2. Visualized Liquid Level Monitoring: Breaking away from the traditional leakage detection method that relies on weighing, this system utilizes a connector between the liquid level tube and the reagent chamber, along with an observation window on the reagent tube, to achieve intuitive visualization of the liquid perfluorohexanone level. Operators can quickly determine leakage conditions simply by checking the scale on the liquid level tube through the observation window without disassembling the device, improving equipment management efficiency and safety. Furthermore, direct visualization of the liquid level addresses customer concerns about insufficient weight.

[0018] 3. Working status feedback mechanism: The built-in feedback line of the composite line can collect the start signal of the feedback device in real time and transmit it to the control center. The staff can know whether the device is working properly at the first time. If the feedback signal shows that the device has started but it has not actually started or the feedback signal is missing (the device has not started), alternative resources such as fire extinguishers and backup fire extinguishing devices can be allocated in time to avoid delaying the fire extinguishing time due to information blind spots and reduce the additional losses caused by the spread of fire.

[0019] 4. When the device starts up, the pressure in the gas generation chamber is greater than that in the reagent chamber, which pushes the piston. Because the pressure in the gas generation chamber is always greater than that in the reagent chamber, perfluorohexanone will not flow back into the gas generation chamber, ensuring safety and guaranteeing the stability of the device. Attached Figure Description

[0020] Figure 1 This is an exploded three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is the front view of the present invention; Figure 4 for Figure 3 Sectional view of AA; Figure 5 for Figure 3 BB section view; Figure 6 for Figure 3 CC section view; In the diagram: 1. Agent tube; 101. Gas generation chamber cover; 102. Nozzle cover; 103. Piston; 104. Gas generation chamber; 105. Agent chamber; 106. Connecting pipe; 2. Atomizing nozzle; 201. Pressure diaphragm; 3. Aerosol generator; 4. Thermistor wire; 5. Composite wire; 6. Electric igniter; 7. Liquid level tube; 701. Sealing plug; 702. Connecting through hole; 703. Tightening screw; 704. Liquid level plate; 8. Mounting bracket; 9. Bolt. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] In this application, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0023] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0024] Example 1: Please refer to Figures 1 to 6A visible liquid level electrically and thermally activated non-pressurized piston-type fire extinguishing device includes an agent tube 1 and an atomizing nozzle 2; characterized in that: a gas-generating chamber cap 101 is fixed at the top of the agent tube 1, and a nozzle cap 102 is fixed at the bottom, with through holes at all four corners; a piston 103 matching the interior is provided inside the agent tube 1, dividing the interior of the agent tube 1 into an upper gas-generating chamber 104 and a lower agent chamber 105; a solid aerosol generator 3 is provided at the top of the piston 103 in the gas-generating chamber 104; and the agent chamber 105 is filled with a sufficient amount of liquid perfluorohexanone (in this embodiment, an aerosol generator 3 is provided in the space within the piston 103); a thermal wire 4 and a... are provided on the gas-generating chamber cap 101. The composite line 5 and the thermal line 4 pass through the gas generation chamber cover 101 and are connected to the aerosol generator 3 inside the gas generation chamber 104. The composite line 5 is connected to the electric ignition head 6 inside the gas generation chamber 104. Specifically, the composite line is divided into an electric wire and a feedback wire. The electric wire is connected to the electric ignition head 6. Both the electric ignition head 6 and the feedback wire are connected to the aerosol generator 3. The agent tube 1 has a vertical liquid level tube 7 in the through hole in the lower left corner. The agent tube 1 has an observation window in front of the liquid level tube 7. The agent chamber 105 has two connecting pipes 106 that penetrate the left wall at the upper and lower positions, respectively. The two connecting pipes 106 are connected to the upper and lower parts of the corresponding liquid level tubes 7, respectively. The atomizing nozzle 2 is located at the bottom center of the nozzle cover 102 and passes through it and is connected to the agent chamber 105.

[0025] The agent tube 1, as the core load-bearing component of the device, is used to contain the core media such as aerosol generator 3 and liquid perfluorohexanone, as well as moving parts such as piston 103. The observation window, together with the liquid level tube 7, enables liquid level visualization, and the four corner through holes provide support for the installation of the liquid level tube and the overall fixation of the device. Piston 103 separates the internal space of agent tube 1, forming independent gas generation chamber 104 and agent chamber 105, avoiding direct contact between aerosol generator 3 and liquid perfluorohexanone; it also provides power for the spraying of the extinguishing medium. The thermal wire 4 enables the device's hot start function. When a fire occurs, if the ambient temperature rises to the ignition threshold of the thermal wire, the thermal wire will spontaneously combust and ignite the aerosol generator 3, triggering the extinguishing process. The composite wire 5 enables the device's electric start and working status feedback functions, both of which are externally connected to the control center (not shown in detail in this embodiment); the wire receives electrical signals from the control center, providing power to the electric igniter 6 and triggering electric start; the feedback wire transmits the device start signal to the control center, allowing staff to know in real time whether the device is working properly, avoiding delays in emergency response. The level tube 7 enables visual monitoring of the liquid perfluorohexanone level. Through the principle of communicating vessels, the liquid perfluorohexanone in the reagent chamber 105 flows into the level tube 7. The staff can quickly determine whether the liquid perfluorohexanone is leaking by looking at the scale of the level tube 7 through the observation window.

[0026] The aerosol generator 3 contains gunpowder components. Mixing gunpowder can improve ignition reliability and combustion speed, shorten the device start-up response time, and the gunpowder has high ignition sensitivity, which can quickly burn and explode upon contact with a spark. During the combustion and explosion process, a large amount of high-pressure and high-speed aerosol is generated to drive the piston 103. The amount of gunpowder must be carefully controlled to ensure that the explosion drives the piston 103 without damaging other components (such as the piston and propellant tube). Gunpowder is not the only option; other materials can also be selected as long as the work can be completed.

[0027] Electric start method: When a fire occurs, the sensor installed in the house detects the fire and sends an electrical signal to the control center. The control center sends an electrical signal to the wire in the composite line 5. The wire causes the electric igniter 6 to work and generate a spark to ignite the aerosol generator 3 (the gunpowder inside burns and explodes). The aerosol generator 3 generates high-pressure, high-speed aerosol that pushes the piston 103. The piston 103 compresses and pushes the liquid perfluorohexanone from the atomizing nozzle 2 to atomize and spray it out for fire extinguishing.

[0028] Thermosensitive wire activation method: When a fire occurs, the indoor temperature rises. Thermosensitive wire 4 is sensitive to temperature. When the temperature rises to the ignition point of the material used in thermosensitive wire 4, thermosensitive wire 4 spontaneously combusts, burning rapidly like the fuse of a firecracker. This ignites aerosol generator 3 (the gunpowder inside burns and explodes). Aerosol generator 3 generates high-pressure, high-speed aerosol that pushes piston 103. Piston 103 compresses and pushes liquid perfluorohexanone from the atomizing nozzle to spray and extinguish the fire.

[0029] The purpose of the feedback line is to send a working signal to the control center when the invention is in operation, informing the control center that the invention has started working. Personnel then observe the fire extinguishing situation inside the building. If no feedback signal is received from the activation device, or if the signal has been received but the fire extinguishing device is found to be damaged and not working, other fire extinguishing methods are promptly employed. In this embodiment, the detection principle is based on a loop switch connected to the bottom of the feedback line (not shown in this embodiment). Because it is connected to the aerosol generator 3, it generates a complete loop signal. When the invention is in operation, the aerosol generator 3 disappears, the loop signal disappears, and a relevant signal is sent. This method is not the only one.

[0030] The liquid level tube 7 is symmetrically provided with two sealing plugs 701 at the top and bottom. The sealing plugs 701 are sealed with the through hole of the agent tube 1 by a sealing ring (other components in this embodiment are also sealed with sealing rings, which will not be described in detail, see the attached drawings), and a pipeline is provided in the middle to communicate with the vertical liquid level tube 7.

[0031] Each sealing plug 701 is divided into upper and lower parts, and a connecting pipe 106 is connected to the space between the two parts and the two parts are in opposite positions.

[0032] The sealing plug 701 has a connecting through hole 702 in the space between the upper and lower parts, which is connected to both the connecting pipe 106 and the pipe in the middle of the sealing plug 701.

[0033] Each of the connecting pipes 106 is provided with a tightening screw 703 at the outlet on the left wall of the agent pipe 1. The tightening screw 703 is pressed against the sealing plug 701 for installing and fixing the sealing plug in order to install and fix the liquid level pipe 7. The lower part of the observation window on the front of the agent pipe 1 is provided with a liquid level plate 704 connected to the bottom of the liquid level pipe 7.

[0034] The liquid level visualization is based on the principle of communicating vessels. The agent chamber 105 and the vertical liquid level tube 7 form a connected loop through the connecting pipe 106, the internal space of the sealing plug 701, and the connecting through hole 702. The liquid perfluorohexanone levels in the two chambers remain consistent, and the remaining liquid perfluorohexanone can be directly read from the weight display corresponding to the scale line on the vertical liquid level tube 7. In non-fire conditions, the liquid perfluorohexanone in the agent chamber 105 flows into the internal space of the corresponding sealing plug 701 through the connecting pipe 106 at the bottom, and then flows into the vertical liquid level tube 7 through the connecting through hole 702 on the sealing plug 701. The top sealing plug 701 and the corresponding connecting pipe 106 can be used to purge air from the vertical liquid level pipe 7, forming a communicating vessel. Operators can check the liquid level scale in the vertical liquid level pipe 7 through the observation window of the reagent pipe 1. If the liquid level scale is within the standard value, there is no leakage; if the liquid level is below the standard value, a leak is detected, and the sealing components must be repaired promptly and liquid perfluorohexanone replenished. Regular monitoring (e.g., every 3 months) should be repeated to ensure the device is always in normal standby condition. The tightening screw 703 and the liquid level plate 704 (in this embodiment, the liquid level plate is fixed to the sealing bolt) also seal the entire communicating pipe circuit to prevent leakage.

[0035] The thermal wire 4 is a spiral shape with a gradually increasing diameter from bottom to top, and it is tilted outwards as a whole. The spiral structure and the gradually increasing diameter design ensure that the thermal wire can quickly and uniformly sense temperature changes, and the outward tilting shape expands the sensing range, avoiding start-up delays and failures.

[0036] The atomizing nozzle 2 is provided with a pressure diaphragm 201 at the top connected to the agent chamber 105. Under normal conditions, the pressure diaphragm 201 seals the inlet of the atomizing nozzle 2 to prevent leakage of liquid perfluorohexanone in the agent chamber 105. When the pressure in the agent chamber 105 rises rapidly to the rupture pressure due to the piston 103, the pressure diaphragm 201 ruptures rapidly, providing a spray channel for the liquid perfluorohexanone and ensuring that the extinguishing medium can be sprayed out in time.

[0037] The gas generation chamber cover 101 and the nozzle cover 102 are respectively provided with mounting plates 8 at their top and bottom. The gas generation chamber cover 101 and the mounting plates 8 are connected to the agent tube 1, and the nozzle cover 102 and the mounting plates 8 are connected to the agent tube 1 by bolts 9. The connection position is detailed in the attached drawing. The mounting plates 8, in conjunction with expansion bolts and other components, provide fixed support for the device in various ways, such as wall mounting and column mounting.

[0038] Working process: When a fire occurs, an external fire detector (such as a heat detector) senses the fire signal and transmits the signal to the control center. After receiving the signal, the control center transmits an electric start signal to the wire in the composite line 5. The electrical signal is transmitted to the electric igniter 6 via the wire in the composite line 5. The electric igniter 6 ignites and generates a spark. The spark ignites the aerosol generator 3 located in the gas generating chamber 104. The gunpowder inside burns and explodes, rapidly generating high-pressure, high-speed aerosol. The high-pressure aerosol pushes the piston 103 to move smoothly and rapidly downward along the inner wall of the agent tube 1. During the downward movement of the piston 103, the liquid perfluorohexanone in the agent chamber 105 is compressed, causing the pressure in the agent chamber 105 to rise rapidly. When the pressure in the agent chamber 105 rises to the rupture threshold of the pressure diaphragm 201, the pressure diaphragm 201 ruptures instantaneously. The liquid perfluorohexanone enters the atomizing nozzle 2 through the ruptured pressure diaphragm 201 and is atomized and sprayed out to extinguish the fire. In addition, when there is no power or the electric start fails, the ambient temperature will continue to rise when a fire occurs, reaching the preset working threshold of the thermal wire 4; the thermal wire 4 will spontaneously combust, and the flame generated by the combustion will ignite the aerosol generator 3 located in the gas generation chamber 104. The subsequent process is the same as the electric start fire extinguishing process, that is, the aerosol pushes the piston 103 → compresses the liquid perfluorohexanone → the pressure diaphragm 201 ruptures → the atomizing nozzle 2 sprays fire extinguishing. Meanwhile, the feedback line in composite line 5 collects the combustion signal of aerosol generator 3 and transmits the "device activated" feedback signal to the fire control center. The staff are aware of the device's operation and can make an actual assessment of the fire extinguishing situation in order to take the next steps.

[0039] In non-fire conditions, the liquid perfluorohexanone in the agent chamber 105 flows out through the connecting pipe 106 at the lower position; the liquid perfluorohexanone flows into the internal space of the sealing plug 701 through the connecting pipe 106; the liquid perfluorohexanone in the internal space of the sealing plug 701 flows into the liquid level pipe 7 through the connecting hole 702; the staff checks the liquid level scale in the liquid level pipe 7 through the observation window of the agent tube 1 and compares it with the standard value to determine whether the liquid perfluorohexanone is leaking; if the liquid level in the liquid level pipe 7 is lower than the standard value, it is determined that there is a leak, and the staff needs to disassemble the parts for inspection and repair and replenish the liquid perfluorohexanone; if the liquid level is normal, the device remains in standby mode and can be monitored repeatedly periodically.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A visual liquid level-controlled, electrically and thermally activated, non-pressurized piston-type fire extinguishing device, comprising an agent tube (1) and an atomizing nozzle (2); characterized in that: The top of the drug tube (1) is fixed with a gas-generating chamber cap (101), and the bottom is fixed with a nozzle cap (102). Through holes are provided at the four corners. A matching piston (103) is provided inside the drug tube (1). The piston (103) divides the inside of the drug tube (1) into an upper gas-generating chamber (104) and a lower drug chamber (105). A solid aerosol generator (3) is provided on top of the piston (103) inside the gas-generating chamber (104), and the drug chamber (105) is filled with a sufficient amount of liquid perfluorohexanone. A thermal wire (4) and a composite wire (5) are provided on the gas-generating chamber cap (101). The thermal wire (4) passes through the gas-generating chamber cap (101) during gas generation. The cavity (104) is connected to the aerosol generator (3), and the composite line (5) is connected to the electric ignition head (6) in the gas generation cavity (104). The electric ignition head (6) is connected to the aerosol generator (3). The agent tube (1) has a vertical liquid level tube (7) in the through hole in the lower left corner. The agent tube (1) has an observation window in front of the liquid level tube (7). The agent cavity (105) has two connecting pipes (106) that penetrate the left wall at the upper and lower positions respectively. The two connecting pipes (106) are connected to the upper and lower parts of the corresponding liquid level tubes (7) respectively. The atomizing nozzle (2) is located at the center of the bottom of the nozzle cover (102) and passes through it and is connected to the agent cavity (105).

2. The electrically and thermally activated non-pressurized piston fire extinguishing device with visible liquid level as described in claim 1, characterized in that: The aerosol generator (3) contains gunpowder components.

3. The electrically and thermally activated non-pressurized piston fire extinguishing device with visible liquid level as described in claim 1, characterized in that: The liquid level tube (7) is symmetrically provided with two sealing plugs (701) at the top and bottom. The sealing plugs (701) are sealed with sealing rings between themselves and the through holes of the agent tube (1), and a pipeline is provided in the middle of the tube to communicate with the vertical liquid level tube (7).

4. The electrically and thermally activated non-pressurized piston fire extinguishing device with visible liquid level as described in claim 3, characterized in that: Each sealing plug (701) is divided into upper and lower parts, and a connecting pipe (106) is formed between the two parts and is in a relatively opposite position to the space.

5. A visual liquid level-based, electrically and thermally activated, non-pressurized piston fire extinguishing device according to claim 4, characterized in that: The sealing plug (701) has a connecting through hole (702) in the space between the upper and lower parts, which is connected to both the connecting pipe (106) and the middle pipe of the sealing plug (701).

6. A non-pressurized piston fire extinguishing device with visible liquid level and electric and thermal start-up according to claim 5, characterized in that: Each of the connecting pipes (106) is provided with a tightening screw (703) at the outlet on the left wall of the medicine tube (1), and the tightening screw (703) is pressed against the sealing plug (701); the lower part of the front observation window of the medicine tube (1) is provided with a liquid level plate (704) which is connected to the bottom of the liquid level tube (7).

7. A visual liquid level-based, electrically and thermally activated, non-pressurized piston fire extinguishing device according to claim 1, characterized in that: The atomizing nozzle (2) is provided with a pressure diaphragm (201) at the top connected to the medicine chamber (105).

8. A non-pressurized piston fire extinguishing device with visible liquid level and electric and thermal start-up according to claim 1, characterized in that: The gas production chamber cover (101) and the nozzle cover (102) are respectively provided with mounting plates (8) at their top and bottom.

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